JPH09211685A - Camera having information recording function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a pressure plate, improve the degree of freedom for the fitting posture of a magnetic head, and sufficiently hold the tight contact state of the magnetic head against the surface of a film, by making the magnetic head movable in the direction of the film surface against a pressure plate holder, and turnably mounting the head on the holder. SOLUTION: A camera body is provided with a cartridge chamber in which a film cartridge is charged on the one end side. A pressure plate holder 12 made of resin holding a pressure plate 11 regulating the position of film surface is arranged on the back side of the camera body. This pressure plate holder 12 is fixed to the camera body so as to be opposite to an opening part for exposure and sandwich the pressure plate 11 between itself and the camera body. A magnetic head 25 for magnetically writing and reading photographing information against the magnetic recording part of the film is mounted on the pressure plate holder 12 in the energized state in the film surface direction so as to be movable and turnable with respect to the film surface through a holder plate 27 and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having an information recording function using a film having a recording portion for recording magnetic information and the like.

[0002]

2. Description of the Related Art Recently, a film having a magnetic recording section is used, and various kinds of photographing information are written in the magnetic recording section by a magnetic head mounted on a camera, and the photographing information is read out if necessary. A camera that does this is proposed. In this type of camera, it is known to use a so-called thrust feeding type film cartridge in which the film stored in the cartridge is fed by rotating the spool.

In a camera loaded with such a film cartridge, it is not necessary to pull out the leading end portion (leader portion) of the film from the cartridge and wind the film around the sprocket, so that the back cover is opened unlike the conventional camera. It is not necessary to provide a mechanism for Therefore, the back surface of the film exposing portion may be covered with a fixing member, and a pressure plate for controlling the film surface position by sandwiching the film in the gap with the camera body, which is conventionally attached to the back cover, is provided. It is possible to fix it to the main body of and to simplify the configuration. In order to mount a magnetic head for performing magnetic writing on the magnetic recording portion of such a film in a camera, there is one in which the magnetic head is mounted on the above-mentioned pressure plate (for example, Japanese Patent Laid-Open No. 4-1).
13343 gazette).

[0004]

By the way, since the magnetic writing / reading in the camera as described above is performed during the feeding of the film, in order to accurately perform the magnetic writing, the magnetic recording portion and the magnetic Care must be taken not to shift the relative position with the head. Therefore, in the configuration in which the magnetic head is mounted on the pressure plate itself that regulates the film surface position as described in the above publication, the shape of the pressure plate itself and the mounting structure of the pressure plate to the camera become complicated. Further, in such a configuration in which the magnetic head is mounted on the pressure plate itself, the degree of freedom in the mounting posture of the magnetic head is small, and thus the close contact with the film surface of the magnetic head may not be sufficiently maintained.

The present invention has been made in order to solve the above-mentioned problems. In a camera using a film having an information recording portion, the magnetic head is not attached to the pressure plate itself, and the structure of the pressure plate is changed. Provided with a camera that can be simplified, has a high degree of freedom in the mounting posture of the magnetic head, can sufficiently maintain the close contact state of the magnetic head with the film surface, and has an information recording function that enables accurate magnetic writing / reading. The purpose is to do.

[0006]

In order to achieve the above object, the invention of claim 1 is, in a camera having an information recording function using a film having an information recording portion, sandwiching the film in a gap with a camera body. A pressure plate holder for holding a pressure plate for regulating the film surface position is attached to the camera body, and a magnetic head for magnetically recording on the film is held by a head guide member so as to be movable in the film surface direction. The member is rotatably mounted on the pressure plate holder. In the above configuration, the magnetic head is movable in the film surface direction with respect to the pressure plate holder via the head guide member,
In addition, since it is rotatably mounted, the close contact state of the magnetic head with the film surface is improved. Further, since the magnetic head is not attached to the pressure plate itself, the pressure plate itself does not have a complicated shape.

According to a second aspect of the invention, in the structure according to the first aspect, the film to be fed is brought into contact with the upper edge or the lower edge of the film integrally with the plate holding the magnetic head. The guide member is provided. In the above structure, the magnetic head can always keep a constant position with respect to the film, and writing / reading to / from the magnetic recording portion of the film can be accurately performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a camera body, which is a frame using a film having an information recording portion, from which an outer cover and the like are removed, as seen from the rear side, and FIG. 2 is a perspective view of a state in which a pressure plate holder is removed from the camera body. Is. The present camera is a camera in which a film having a magnetic information recording unit is used and a film cartridge of a so-called thrust feeding system in which the film is fed by rotating a spool is loaded. The camera body 1 is provided with a cartridge chamber 2 into which a film cartridge is loaded at one end side, an exposure opening 3 is opened at the center, and a spool chamber 4 is provided at the other end side. A photographing lens, a shutter, and the like are arranged in the space A in front of the opening portion 3, a mechanism for feeding a film and the like are appropriately arranged in the lower portion, and further, around the camera body 1. Although the outer case is assembled, their illustration is omitted. The cartridge chamber 2 is configured to rotate around the shaft 2a at the lower end so that a film cartridge can be loaded therein.

On the rear side of the camera body 1, a resin pressure plate holder 1 for holding a pressure plate for regulating the film surface position.
2 is placed. The pressure plate holder 12 is fixed to the camera body 1 so as to face the exposure opening 3 and to sandwich the pressure plate 11 (FIG. 3) between the pressure plate holder 12 and the camera body 1. Further, in the pressure plate holder 12, a magnetic head 25 for magnetically writing / reading photographing information to / from the magnetic recording portion of the film is movably and rotatable with respect to the film surface via a holder plate 27 or the like. It is mounted in a biased state in the plane direction. The details will be described later.

3 and 4 are perspective views of the pressure plate holder 12 viewed from the front side. The pressure plate holder 12 holds a pressure plate 11 made of metal, which holds a film in a gap between the pressure plate holder 12 and the camera body 1 and regulates the position of the film surface so as to be held. The pressure plate holder 12 is fixed to the camera body 1 by inserting a hook portion 13 formed at a lower end thereof into a hole formed at a lower end of a rear surface of the camera body 1 and tightening a screw using a screw hole 14 or the like at an upper end portion. To be done.

A structure in which the unit body of the magnetic head 25 is movably and rotatably mounted on the pressure plate holder 12 will be described below. An opening 12a is formed in a portion to which the magnetic head 25 is attached, and an attachment portion 12b for rotatably attaching the unit body is formed on an inner surface immediately below the opening 12a. The unit body of the magnetic head 25 is composed of a head guide member 24 as a base body, and a holder plate 27 to which the magnetic head 25 is attached and a head holder 26, which are sandwiched with the head guide member 24 sandwiched from both sides. The holder plate 27 and the head holder 26 are connected to each other by inserting screws (not shown) into the screw holes 27a and 26a. In this combined body, the projection 26b of the head holder 26 is guided by the concave portion 24a of the head guide member 24, and is vertically slidable within a predetermined range. Further, the head guide member 24 has a shaft portion 24b fitted with the mounting portion 12b.
Is provided. The unit body is rotatably supported by the pressure plate holder 12 through the opening 12a of the pressure plate holder 12 by fitting the shaft portion 24b of the head guide member 24 into the mounting portion 12b, and is attached in the film surface direction. It is in a state of energization. The film contact surface 25c of the magnetic head 25 has the opening 11a (see FIG. 3) of the pressure plate 11.
Through), the magnetic recording portion on the film surface is brought into contact with the magnetic recording portion for magnetic recording.

Further, the holder plate 27 is provided with pins 43 and 44 as guide members for guiding the film to be fed. This pin 43,44
Is a cutout hole 12c formed in the pressure plate holder 12, the opening 12a, and a cutout hole 11b in the pressure plate 11,
It projects through the opening 11a into the film feeding path and extends along the upper edge of the film to be fed. Thereby, the magnetic head 2
No. 5 is always in contact with a fixed distance from the edge of the film so that magnetic writing can be performed at the same height position.

Further, the pressure plate holder 12 is provided with a holder 46 for holding a pressing roller 45 for preventing the film wound on the spool in the spool chamber 4 from being loosened. Further, a guide slope 12d and a guide curved surface 12e for integrally guiding the film with the pressure plate holder 12 are formed. Further, the pressure plate 11 and the pressure plate holder 12 respectively have holes 51, 52 and 53 for measuring and adjusting the speed of a shutter film (a shutter will be described later with reference to FIG. 7), and holes 5 corresponding thereto.
4,55,56 have been opened. Details of these will be described later. A frame B indicated by a broken line in FIG.
The area corresponding to the opening 3 of FIG.

In the camera according to the above embodiment,
The unit body of the magnetic head 25 includes a head guide member 24.
Since the magnetic head 25 is rotatably attached to the pressure plate holder 12 via the and is movable in a predetermined range in the film surface direction, the magnetic head 25 is surely brought into close contact with the film surface. Therefore, magnetic writing and the like can be performed accurately.

FIG. 5 is a partial perspective view of the pressure plate holder 12 and the pressure plate 11 as seen from the front side. The pressure plate holder 12 is integrally formed with a guide slope 12d that constitutes a gate portion for introducing the film thrust out of the film cartridge into the gap between the pressure plate 11 held by the pressure plate holder 12 and the camera body 1. Has been done.
The guide slopes 12d are formed at upper and lower ends of the pressure plate holder 12 on the film introduction side with a predetermined space C wider than the film photographing area. The height of the guide slopes 12d is the pressure plate held by the pressure plate holder 12. The thickness is approximately the same as the thickness dimension of 11, and the end surface portion of the pressure plate 11 on the guide slope 12d side is
It is rounded so that the leading end of the thrust film can be smoothly fed without being caught. In this way, the guide slopes 12d are provided at intervals C, so that members contacting the film do not protrude within the range of the interval C.
It is possible to prevent the filming area of the film fed and guided as shown by an arrow from being scratched. Further, the guide slope 12d may be provided integrally with the pressure plate holder 12 which is a molded product made of a resin material or the like, and the manufacture is easy. Further, since the guide slope 12d is provided, the guide plate 12d The shape itself can also be simplified.

FIG. 6 is a top view of the pressure plate holder 12 on the spool chamber side. On the spool chamber 4 (see FIGS. 1 and 2) side of the pressure plate holder 12, a guide curved surface 12e for guiding the film toward the take-up spool 4a disposed inside is integrally formed with the pressure plate holder 12. ing.
By providing the guide curved surface 12e integrally with the pressure plate holder 12 as described above, the number of parts and the number of mounting steps can be reduced as compared with the case where a guide member is separately provided, and the pressure plate holder 12 can be opened and closed as in the conventional case. Since it is fixed to the camera body 1 instead of being fixed to the back cover, it is possible to improve the positioning accuracy of the guide curved surface 12e with respect to the take-up spool 4a.

FIG. 7 is an exploded perspective view of the pressure plate 11 and the pressure plate holder 12 and the shutter arranged in front of the pressure plate 11 as viewed from the back side. An opening 62 of the shutter 61 is arranged in the space A corresponding to the opening 3 of the camera body 1 (FIG. 1), and a slit formed by a built-in shutter film moves the opening 62 up and down to control the exposure time. It is a thing.
The above-mentioned holes 51, 52, 53 provided in the pressure plate 11 and the pressure plate holder 12, and holes 54, 5 corresponding to them.
Reference numerals 5 and 56 are located at photometric points in the traveling direction of the shutter film in the area corresponding to the opening 62. Further, a main flexible board (not shown) on which an electronic circuit is mounted is attached to the back side of the pressure plate holder 12, and holes are also formed in this board at positions corresponding to the holes. These holes are provided for measurement to adjust the shutter film speed.

The shutter film speed is measured by the pressure plate holder 1.
A shutter speed tester (not shown) is installed on the rear side of the rear side of the main flexible printed circuit board 2 to operate the shutter. At that time, holes 51 and 54, holes 52 and 55,
The shutter film speed is measured by detecting the timing of light incident through the holes 53 and 56 with the same tester. Since there are three photometric points in the traveling direction of the shutter film, it is possible to check the movement of the entire shutter film, but it is sufficient if there are at least two photometric points. Since the shutter film speed is measured as described above, the shutter film speed can be measured without removing the pressure plate 11, the pressure plate holder 12 and the main flexible substrate. Further, since the shutter film speed can be measured without touching the main flexible substrate, the measurement can be easily carried out even in a considerably later step in the camera production process. In addition, for the same measurement, the pressure plate 1
If one has to be removed, then again the platen 1
Although the work of assembling 1 with high accuracy is troublesome,
Such a problem does not occur.

The present invention is not limited to the configuration of the above embodiment, but various modifications can be made. For example, a configuration in which the unit body of the magnetic head 25 is mounted on the pressure plate holder 12 via the head guide member 24 is
Any mode can be adopted as long as 5 is mounted so as to be movable in the film surface direction and rotatable.

[0020]

As described above, according to the invention of claim 1,
In a camera having a magnetic recording function, the magnetic head is attached to the pressure plate holder via the head guide member so as to be movable in the film surface direction and rotatable.
The posture of the magnetic head has a high degree of freedom, and the close contact of the magnetic head with the film surface is improved. Therefore, accurate magnetic writing / reading is possible. Further, since the magnetic head is not attached to the pressure plate itself, the pressure plate can be made into a simple shape.

According to the second aspect of the present invention, in addition to the above effects, since the plate holding the magnetic head is provided with the guide member for guiding the film, the magnetic head is always fixed with respect to the film. The position can be maintained and the magnetic recording part of the film can be accurately written and read.

[Brief description of drawings]

FIG. 1 is a perspective view of a camera body according to an embodiment of the present invention as viewed from the rear side.

FIG. 2 is a perspective view showing a state where a pressure plate holder arranged on the back side of the camera body is removed.

FIG. 3 is a perspective view of a pressure plate holder portion as viewed from the front surface.

FIG. 4 is a perspective view of the pressure plate holder portion as seen from the front surface.

FIG. 5 is a partial perspective view of the pressure plate holder and the pressure plate viewed from the front side.

FIG. 6 is a top view of the pressure plate holder on the spool chamber side.

FIG. 7 is an exploded perspective view of a pressure plate, a pressure plate holder, and a shutter arranged in front of the pressure plate as viewed from the back side.

[Explanation of symbols]

 1 Camera Body 11 Pressure Plate 12 Pressure Plate Holder 24 Head Guide Member 25 Magnetic Head 27 Holder Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Inoue 2-3-13 Azuchi-cho, Chuo-ku, Osaka Inside the Osaka International Building Minolta Co., Ltd. (72) Hiroyuki Miyake 2-3-3 Azuchi-cho, Chuo-ku, Osaka No. 13 Osaka International Building Minolta Co., Ltd.

Claims (2)

[Claims] 1. A camera having an information recording function using a film having an information recording portion, wherein a pressure plate holder for holding a pressure plate for sandwiching the film in a gap with the camera body and regulating the film surface position is provided in the camera body. A magnetic head for magnetically recording on the film is movably held in the film surface direction by a head guide member, and the head guide member is rotatably mounted on the pressure plate holder. A camera with a function to record information. 2. A guide member for contacting an upper edge or a lower edge of the film to guide the fed film is provided integrally with the plate for holding the magnetic head. A camera with the described information recording function.